Respond to the following situations using the words in the brackets and the perfect infinitive
(have+ v3)
eg. i can't find my ticket (must, drop)
you must have dropped it

1. John didn't come to school yesterday. (must, ill)
2. Why is Isabel late for class? (might, oversleep)
3. The teacher is checking Maria's work. (can't, finish already)
4. Did you know that Charles got top marks in the exam? (must, cheat)
5. Where's my umbrella? (could, leave it on the train)